which file contains a serialized form of all the directory and files inodes in the filesystem, givin

In CDH4 and later, which file contains a serialized form of all the directory and files inodes in
the filesystem, giving the NameNode a persistent checkpoint of the filesystem metadata?

A.
fstime

B.
VERSION

C.
Fsimage_N (where N reflects transactions up to transaction ID N)

D.
Edits_N-M (where N-M transactions between transaction ID N and transaction ID N)